WO2019196992A1 - Ventilateur et grille d'admission pour ventilateur - Google Patents

Ventilateur et grille d'admission pour ventilateur Download PDF

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Publication number
WO2019196992A1
WO2019196992A1 PCT/DE2019/200013 DE2019200013W WO2019196992A1 WO 2019196992 A1 WO2019196992 A1 WO 2019196992A1 DE 2019200013 W DE2019200013 W DE 2019200013W WO 2019196992 A1 WO2019196992 A1 WO 2019196992A1
Authority
WO
WIPO (PCT)
Prior art keywords
webs
inflow
fan
region
grid
Prior art date
Application number
PCT/DE2019/200013
Other languages
German (de)
English (en)
Inventor
Frieder Loercher
Alexander Herold
Original Assignee
Ziehl-Abegg Se
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ziehl-Abegg Se filed Critical Ziehl-Abegg Se
Priority to CN201980038538.2A priority Critical patent/CN112262261B/zh
Priority to BR112020020491-9A priority patent/BR112020020491A2/pt
Priority to KR1020207032305A priority patent/KR20200141079A/ko
Priority to US17/046,451 priority patent/US11703065B2/en
Priority to JP2020553571A priority patent/JP2021519885A/ja
Priority to EP19715390.1A priority patent/EP3775571A1/fr
Publication of WO2019196992A1 publication Critical patent/WO2019196992A1/fr
Priority to JP2023164145A priority patent/JP2023169380A/ja

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/12—Kind or type gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • the present invention relates to a fan (axial, radial or diagonal fan) with an impeller and a Vorleit adopted in the flow path in front of the impeller, preferably in front of the inlet region of an inlet nozzle, the Vorleit driving is designed as Einströmgitter mitflambaigen webs and wherein the webs a Form variety of grid cell-like flow channels. Furthermore, the invention relates to a special Vorleit driving which is designed in the sense of Einströmgitters with flat webs.
  • a generic fan with inflow-side lead-in device is known, for example, from WO 03/054395 A1.
  • the Vorleiteinrich- tion provided there serves primarily the flow compensation, especially for noise reduction.
  • the known pre-guide device generates a pre-twist in the direction of rotation of the impeller. It is essential that acoustic improvements are regularly accompanied by losses of airflow and efficiency.
  • the Vorleit tone provided there is also very expensive to manufacture.
  • Vorleiter are already known, which serve to favor the efficiency and / or the air performance.
  • these guide wheels cause acoustic disadvantages and are complicated in structure and in the installation in the respective fan products. They are regularly installed in front of fan impellers in a cylindrical space with a diameter approximately equal to that of the fan impeller and thus do not have a significantly larger flow area than the fan. As a result, the air speeds in the area of these preliminary guide wheels are relatively high, which in particular causes the acoustic disadvantages.
  • the invention is based on the following technical problem.
  • the present invention is therefore based on the object to design a fan and further develop such that a noise reduction takes place in disturbed inflow.
  • the fan should be compact and have very low pressure losses.
  • a Vorleit tone, in particular a Einströmgitter or Vorleitgitter be specified, which meets the above requirements and which can be produced with economic tooling in plastic injection molding. It should be dimensionally stable and advantageously take over the function of an upstream splash guard.
  • the webs extend predominantly between preferably two branches or between each branch in an edge region. Depending on the junction, preferably three bridges meet. With these features very special grid cell-like flow channels are formed, which are suitable to reduce noise in disturbed inflow.
  • the independent claim 2 solves the above problem in that the flow channels at least partially have a honeycomb-like cross-section. On top of that, a very special stability is achieved by this embodiment.
  • the further subordinate claim 3 claims a further alternative, where after the Einströmgitter has a basket-like contour, this embodiment is based on the outer and / or inner envelope surface of the inflow grating.
  • the independent claims are based on the basic idea of providing an inflow grille or inflow grille in front of the inlet nozzle of a ventilator, in order to reduce the noise arising during operation of the ventilator in the event of disturbed inflow.
  • the inflow grating is defined by planar webs, the webs being arranged relative to one another in such a way that lattice-cell-like flow channels are formed.
  • the clever combination of the webs forming branches and junctions makes it possible to realize advantageous geometries, for example to the effect that the flow channels have a honeycomb-like cross-section.
  • honeycomb is to be understood in its broadest sense, meaning that it also includes polygons, for example lattice cells with a 4-cornered, 5-edged, or 6-edged or polygonal cross-section.
  • the inflow grid has a basket-like contour, wherein the contour can relate both to the outer and to the inner envelope surface of the inflow grid.
  • An inflow grating of the aforementioned type does justice to the radial inflow in the region near the nozzle plate.
  • the flow channels have an advantageous effect on low pressure losses.
  • the basket-like outer contour is also advantageous for demoldability in the context of an injection molding technique to be used, especially in the case of plastic parts.
  • compact grids can be produced with the appropriate properties.
  • the basket-like outer contour if this is continuous and curved.
  • the grid bars should be as thin as possible, for example in the range of 0.25 mm to 1 mm bar thickness. In the direction of flow, they should have a depth of at least 5 mm (hence the term "flat web" selected in the claims).
  • the grid webs form a non-structured grid in which honeycomb grid cells are combined with each other.
  • the lattice cells can be polygonal and combined with one another or with one another. In this way, a minimal obstruction through grid bars can be achieved, in particular if a certain maximum grid width is necessary due to the required noise reduction or taking account of aspects of the protection against scrubbing, which leads to low pressure and efficiency losses.
  • the Einströmgitter extends in a further advantageous manner over the entire range to the imaginary extension of the fan axis, so has no or no particularly large opening in the inner region.
  • a central opening is not necessary in the light of the teaching according to the invention, indeed even to be avoided, if the inflow grille additionally fulfills a contact protection.
  • a central opening prevents noise minimization and stability of the grid.
  • the special configuration of the inflow grate is of particular advantage, not only with respect to the grate cell-like flow channels, but also with respect to the continuous and curved outer contour.
  • Honeycomb elements with 4, 5 or 6 corners make it possible to realize unstructured grids, whereby variable grid widths can be realized across the entire inflow grate, as required.
  • the inflow grille according to the invention is for use in an axial, radial or diagonal fan and is designed according to the above statements.
  • the inflow grille according to the invention is for use in an axial, radial or diagonal fan and is designed according to the above statements.
  • Fig. 1 in a perspective view from the inflow side of a
  • FIG. 1a is a perspective view of a schematic detail of a constructed from webs cell according to FIG. 1, wherein characteristic dimensions of the webs and cells are characterized
  • FIGS. 1 to 4 in a side view and in section on a plane through the axis of the inflow grating according to FIGS. 1 to 4, wherein characteristic dimensions of the inflow grille are shown;
  • FIG. 6 shows a perspective view of the inflow side of a further embodiment of an inflow grating according to the invention, 7 in axial plan view, seen from the outflow side, the inlet grille of FIG. 6,
  • FIG. 8 is a perspective view of the inflow side of another embodiment of an inflow grating
  • FIGS. 8 and 9 are axial plan views, viewed from the inflow side, of the inlet grille of FIGS. 8 and 9,
  • FIGS. 8 to 10 wherein characteristic dimensions of the inflow grille are shown;
  • FIG. 12 is a side view and in section on a plane through the axis of another example of a Einströmgitters invention with curved webs,
  • FIG. 13 shows a perspective view of the inflow side of a further embodiment of an inflow grating according to the invention with a central, closed Anspritz Scheme,
  • FIG. 14 is an axial plan view, viewed from the inflow side, of the inlet grille of FIG. 13, FIG.
  • FIGS. 13 and 14 are side views of the inflow grating according to FIGS. 13 and 14,
  • 16 is a side view and in section on a plane through the axis of the inflow grating of FIG. 13 to 15, 17 is a perspective, schematic view seen from the inflow side and cut on a plane through the axis of a fan with motor, impeller, inlet nozzle, a nozzle plate and the Einströmgitter according to FIG. 13 to 16.
  • Fig. 1 shows an embodiment of an inflow grille 1 in a perspective view from the front, i. seen from the inflow side.
  • the inlet grille 1 is advantageously mounted in front of the inlet nozzle 2 of a fan, similar to the illustration in FIG. 17, so that its axis coincides approximately with the axis of rotation of the fan.
  • the air initially flows through the inflow grating 1 into the inlet nozzle 2 before undergoing a total pressure increase when it flows through an impeller 3 of the fan, which is driven by a motor 4.
  • the inflow grille 1 equalizes the inflowing air, which reduces the noise generated in the impeller.
  • the inflow grating 1 consists of a plurality of webs 5, which define grid cells 6.
  • the grid cells 6 are flowed through during operation of the fan, that is, they form flow channels.
  • the inflowing air has a lower speed in an area in front of an inlet nozzle 2 than in the interior of an inlet nozzle 2, since the area through which the air mass flow is conveyed is greater in an area in front of an inlet nozzle 2 than in an inlet nozzle 2.
  • the inflow grating 1 is used in such an area rather low flow velocities, ie the throughflow velocity in the inflow grille 1 is lower than the throughflow velocity in the inlet nozzle 2. As a result, flow losses and generation of noise at the inlet grate 1 are kept low.
  • the contour of Einströmgitters 1 not completely flat perform.
  • the contour can be described approximately by the outer envelope surface 7 and / or the inner envelope surface 8 (FIG. 2) of the inflow grating 1.
  • These envelope surfaces 7, 8 are defined by the totality of the inflow-side and outflow-side end faces 7a and 8a of the webs 5 (see FIG. 1a), supplemented by imaginary continuous or curvature-continuous completions in the region of the flow channels 6.
  • FIG. 1a shows, in a detailed, enlarged representation, a region of the inflow grating 1 from FIG. 1.
  • the webs 5 have a significant depth t (9), advantageously approximately 6-20 mm, in the direction of flow. Therefore, the webs 5 are also referred to as "flat" webs.
  • a grid cell 6 is furthermore significantly characterized by a cell width w (12), for example defined by the radius of the largest in-sphere of the cell 6.
  • a small grid width w (12) is advantageous, for example a value of w (12 ) of not more than two to three times the depth of t (12) for the vast majority of the cells 6 of an inflow grating 1.
  • the cell width w (12) also represents a contact protection device which, according to regulations and standards , Requirements for the cell width w (12) must comply with the cell shape and the distance of the cell 6 from a rotating part of the fan. As a result, the size of the cell width w (12) is additionally limited to the top.
  • the inflow grille 1 has attachment areas 18 at the outer area, which serve to fasten the inflow grille 1 to the inlet nozzle 2 or the nozzle plate 32 (FIG. 17).
  • attachment areas 18 come in various ways in question. Possible attachments are screws, rivets, snap hooks, bayonet locks, gluing, snap-fastening, hook-and-loop fasteners or others. In the exemplary embodiment, a screw hole is provided in each case at four attachment regions 18.
  • the basket-like contour of the inner enveloping surface 8 of the inflow grille 1 can be clearly seen.
  • this contour runs a little way, advantageously more than 10 mm or more than 8% of the outer diameter D (20) (FIG. 5), approximately parallel to the imaginary center axis approximately on a cylinder jacket (cylinder jacket-like region 34).
  • cylinder jacket-like region 34 In this cylinder jacket-like region 34 are the cells 19 of the outer row, of which in each case two adjacent ones are separated from each other by a web 35 of the outer row.
  • the cells 19 of the outer row have a rather oblong shape.
  • the cell widths w incoupling radii, in the case of the cells 19 of the outer row essentially determined by the distance between two adjacent webs 35 of the outer row
  • the contour is flat or flat approximately orthogonal to the axis (flat area 33).
  • the transition from the flat region 33 to the cylinder jacket-like region 34 takes place via a short transition region 24 which, in the exemplary embodiment, is curved.
  • the outer envelope surface 7 and the inner envelope surface 8 extend approximately parallel.
  • the division of the regions 33, 34, 24 can be made on the basis of the outer and / or the inner envelope surface 7 or 8.
  • FIG. 3 the Einströmgitter 1 according to FIGS. 1 and 2 in axial plan view from the front (viewed from the inflow side) is shown.
  • Such Einströmgitter 1 is advantageously produced in plastic injection molding. It is also advantageous to select the viewing direction from FIG. 3 as a removal direction for an injection molding tool in order to keep tool complexity low.
  • a tool part then moves relative to the inflow grating 1 towards the viewer, advantageously the nozzle side of the tool, and another tool part away from the observer.
  • the injection molding tool advantageously has no further slides for the sake of simplicity of manufacture.
  • the attachment portions 18 are in interaction with the grid bars 5 designed such that their removal from an injection mold undercut in a slide direction parallel to the axis (corresponds to the line of sight in this illustration) is possible.
  • the webs can advantageously also have a curvature in order to guide the flow optimally.
  • a web 29 is marked, which is an axially aligned web, i. it is aligned parallel to the axis (viewing and sliding direction), which facilitates its demolding.
  • Axially aligned webs 29 are advantageously provided with a Entformschräge.
  • the two radially outermost rows of lattice webs 5, which run approximately in the circumferential direction, run in the transition region 24 of the enveloping surfaces 7 or 8 and are coordinated with one another in such a way that only little or no undercutting regions arise, ie. they do not obscure, or only slightly, in the axial direction.
  • the cells in the near-axis region are smaller than those in an off-axis region.
  • the cell size or cell width w (12, see FIG. 2) is optimized with regard to compliance requirements the protection against contact and with regard to the acoustic improvements or flow comparisons to be achieved.
  • the distribution of the cells is optimized with a special algorithm. There are (when viewed on one of the envelope surfaces 7 or 8), the most diverse cell contours, in particular, but not exclusively, regular and irregular 4-6 corner. Approximately each cell (viewed on an envelope surface 7 or 8) describes a range of points which are closest to a central point (on the envelope surface) compared to the imaginary central points of all other cells.
  • the structure of the grating 1 is also characterized in that exactly 3 webs 5 meet in the vast number of branching regions 15; 4 webs 5 meet in far fewer branching regions. Furthermore, there are no relatively small cells along the edge a flow area of less than 50% with respect to the flow area of one of their neighboring cells, which results from an effect of "intersecting outer cells with the boundary".
  • the inflow grating 1 from FIGS. 1 to 3 is shown in axial plan view from the rear (viewed from the outflow side).
  • the axially aligned webs 35 of the outer row have a free end 14.
  • they can be removed from a tool slide, which moves when opening in the direction of the downstream side (toward the viewer). That the ends 14 of the outer webs 35 are not connected, is disadvantageous in terms of strength and dimensional stability, but can be compensated by a high-quality material or by large wall thicknesses d (10).
  • a segmentation can advantageously be used to join inflow grids 1 of several injection-molded segments, for example by clipping, latching, screwing, gluing, fastening to the nozzle plate, or the like.
  • the central part can be simply designed, in particular flat or flat.
  • Fig. 5 shows the Einströmgitter 1 according to FIGS. 1 to 4 in a side view and in section at a plane through the axis.
  • the course of the basket-like contour of the inflow as well as the outflow-side enveloping surfaces 7 and 8 can be easily recognized.
  • the outer envelope surface 7 has an outer diameter D (20), which is also referred to as the diameter D (20) of the inflow grating 1, in which case the diameter of the attachment regions 18 is not taken into account.
  • the outer envelope surface 7 and inner envelope surface 8 in the exemplary embodiment are approximately parallel to one another.
  • the distance of the envelope surfaces 7 and 8 from each other is advantageously 6 mm to 18 mm or is about 3% -10% of the diameter D (20) of the inflow grating 1.
  • the transition to the flat region 33 is continuous and curved in a transition region 24, in the illustration on the right (inflow side).
  • the transition region 24 has a small extent in the radial direction of less than 12.5% of the outer diameter D (20).
  • the flat region 33 has a diameter DE (21), which is advantageously relatively large and has at least 75% of the value of the outer diameter D (20).
  • the inflow grating 1 has an axial height H (22), wherein the cylinder jacket-like area at the outer envelope surface 7 has an axial extent of HZ (23). HZ (23) is advantageously greater than 6% of the diameter D (20).
  • the basket-like contour of the inflow grating 1 or its enveloping surfaces 7, 8 is well adapted with regard to the flow conditions.
  • an air which flows in more radially from the nozzle plate 32 is to be expected, which due to the cylindrical jacket-like shape of the grid 1 in this region 34 this approximately transversely to the envelope surfaces 7, 8 on a short path and thus can happen with low flow losses.
  • an axial inflow is to be expected, which then likewise flows through the grating 1 over a short path transversely to the enveloping surfaces 7, 8.
  • a short extension transition region 24, a low overall height H (22) can be achieved, which is advantageous for a low footprint of Einströmgitters 1.
  • the axial height H (22) is not greater than 25% of D (20).
  • the targeted alignment of the webs can be seen well, which do not always run exactly perpendicular to the enveloping surfaces, but it is optimally adapted partially deviating significantly from the exact inflow direction.
  • the webs 5 are not curved in the flow direction. However, this is quite conceivable in other embodiments.
  • the outer ends 14 are open, that is not connected to each other (except at the attachment areas 18).
  • FIG. 6 shows a further exemplary embodiment of an inflow grille 1 in a perspective view from the front (viewed from the inflow side).
  • the outer ends 14 of the webs 35 of the outer row are connected via an outer connecting ring 25.
  • the dimensional stability of the outer webs 35 is increased, which may be advantageous in terms of compliance with the requirements imposed on a contact protection, in particular if softer or more elastic materials are used.
  • the outer connecting ring 25 may be advantageous.
  • the connecting ring 25 is connected to the webs 35 by means of a connection 27. This connection is Extended range of the outer webs 35 designed in the form of a rounding with a large radius of curvature> 3 mm.
  • the attachment areas 18 are integrated in the connecting ring 25.
  • the connecting ring 25 lies in a plane which represents the screwing plane towards the nozzle 2 or the nozzle plate 32.
  • the connecting ring 25 can extend axially offset from the fastening plane, apart from the fastening regions 35. This creates space in the assembled state between the nozzle 2 and the nozzle plate 32 and the connecting ring 25. The presence of such a place may be necessary for existing screw heads, with which, for example, the nozzle 2 and the nozzle plate 32 may be screwed, or to Druckent Spotifyein- to be able to place directions.
  • the connecting ring extends in areas offset axially from the screwing plane, some or all of the webs 35 of the outer row may project beyond this towards the nozzle 2 or the nozzle plate 32, or end at the connecting web 25 in the axial direction. It can be mounted in the area between the connecting web and screw level also more webs.
  • the connecting ring 25 is partially interrupted and thus individual outer ribs 35 with open outer ends 14 are present. These outer ribs 35 with open outer ends 14 may also be shortened so that the outer ends 14 are spaced from the screwing plane. Again, this can serve to create space for screw heads, pressure relief devices or the like between screw level and Einströmgitter 1 in the assembled state.
  • the Einströmgitter 1 is shown in FIG. 6 in axial plan view from behind (seen from the downstream side). It can be seen in this illustration, in particular, that the connecting ring 25 is radially completely outside all webs 5, except for the axially aligned webs 35 of the outer row with their connections 27 to the connecting ring 25.
  • This is particularly advantageous for the releasability of the grid 1 a simple on-off injection mold.
  • four identical cells 26 of the grid 1 constructed of four equal segments are shown in FIG. Since the number of mutually different cells is greatly reduced by such a segmentation, reduces the effort in the construction of the grid 1 and especially the associated injection mold.
  • FIG. 8 shows an inflow grid 1 in a perspective view from the front (viewed from the inflow side).
  • the cells 6 and the webs 5 are arranged there neither honeycomb-like nor unstructured, but radially extending and extending over the circumference webs 5 are formed.
  • Four radially extending webs 5 meet in the central axis region at a central branching point 16.
  • the number of webs 5 which meet per branching region 15 is predominantly 4.
  • the inflow web 1 has a basket-like contour of the outer enveloping surface 7. In this embodiment, no transition region is formed between the flat portion 33 and the cylinder jacket-like portion 34, but a "kink" separating these two portions.
  • the attachment regions 18 in the inflow grating 1 according to FIG. 8 are, as seen in the circumferential direction, mounted between in each case two adjacent webs 35 of the outer row of the lattice 1.
  • the webs 5a and 5b shown by way of example have a large undercut area 17 with respect to a removal direction parallel to the axis. Due to this large undercut area, removal from a simple on-off injection mold parallel to the axial direction is unimaginable. A removal from the mold is conceivable with sliders that form a star shape radially outwardly, which form the part of the grid 1 corresponding to the cylinder jacket-like part 34.
  • FIG. 9 the inflow grating 1 according to FIG. 8 is shown in a perspective view from the rear (seen from the outflow side). The basket-like contour of the inner envelope 8 is clearly visible.
  • the Einströmgitter 1 in axial plan view from the front (viewed from the inflow side) shown.
  • four identical cells 26 of the quadrangular segmentation are shown.
  • the Einströmgitter 1 is shown in FIGS. 8 to 10 in a side view and in section on a plane through the axis.
  • the diameter D (20) of the grating 1 and the diameter DE (21) of the flat region 33 correspond to each other, since no transition region is formed.
  • the axial height H (22) of the grating 1 is slightly larger than the axial height HZ (23) of the cylindrical part, since the mounting portions 18 project axially to the right (to the screwing back) over the grid.
  • FIG. 12 shows a further embodiment of an inflow grille 1 according to the invention in a side view and in section on a plane through the axis.
  • the webs 5 in the exemplary embodiment are partially curved when viewed in section.
  • an even better adaptation of the grating 1 or the webs 5 to the inflow can be achieved.
  • advantages in the demolding at fixed flow-favorable surface angles of the webs 5 on the inflow side can be achieved.
  • curved webs 5 if required, a targeted, low-loss diversion of the inflow can be achieved. Any curvatures (direction, amount) are conceivable. Curved webs 5 can simultaneously be axially aligned webs.
  • FIG. 13 shows a further embodiment according to the invention of an inflow grille 1 in a perspective view from the front (viewed from the inflow side).
  • the grid 1 is constructed in an unstructured manner, so that in the majority of cases 3 webs 5 meet at the branching regions 15.
  • An outer connecting ring 25 is formed, via which the webs 35 of the outer row are connected to one another.
  • the connections 27 of the outer webs 35 to the connecting ring 27 are formed as fillets with relatively large radii of curvature in extension of the webs themselves.
  • connections 27 extend in the radial direction over a large part of the radial extent of the connecting ring 25 (over more than half of this area).
  • Four attachment regions 18 are integrated in the course of the connecting ring 25.
  • the outer webs 35b which are approximately centrally located on the attachment regions 18 in the circumferential direction, are reduced in their outer diameter in order to gain access to the attachment of the inflow grille to the attachment regions 18.
  • These outer webs 35b reduced in outer diameter are advantageously lengthened inwards in diameter in order to have the necessary stability and the necessary cross section for the injection molding process (see also the web 35b of the outer row in the region of a fastening region 18 in FIG. 16).
  • a closed, central injection area 28 is formed.
  • the liquid plastic is injected centrally at this Anspritz Scheme 28 and then distributed over this disc-like area in the webs 5.
  • the innermost webs 5 have in this embodiment, an inner end 31 to which they are connected to the central Anspritz Scheme 28 ,
  • the inflow grating 1 according to FIG. 13 is shown in an axial plan view from the front (viewed from the inflow side).
  • This embodiment is completely undercut-free with respect to demoulding in the axial direction.
  • two webs 5a and 5b are shown whose position is coordinated with one another such that they do not overlap one another, as seen in this axial plan view.
  • the choice of the depth of travel t (9), the position and the orientation of the webs, taking into account the compliance with the contact protection regulations, must be observed.
  • axially aligned webs 29 In order to avoid undercut areas near branching areas 15, it is avoided, by using axially aligned webs 29, that two axially out of alignment webs 30 meet at a branching area 15, whose wall normal vectors x components (paraxial components) aligned in the same cell 6 have different signs. As a result, in a branching region 15 in the exemplary embodiment, often two axially non-aligned webs 30 strike an axially aligned web 29, or three axially aligned webs 29. Other combinations occur less frequently. Axially aligned webs 29 are advantageously carried out with Entformungsschrägen to facilitate their removal from an injection mold. In an injection mold, both sides of an axially aligned web are formed by the same tool part. The property "axially aligned" strictly speaking applies to a central area between the two sides of an axially aligned web 29.
  • all webs 5 are formed as axially aligned webs 29 in a radially inner region, for example from a certain limiting radius.
  • the tool can be designed so that with the corresponding inner cells 6 with exclusively or predominantly axially aligned webs 29 no tool parting line runs obliquely through the cells, but the complete contour of the cells can be introduced into a tool part. This further facilitates tool production. Due to the axial Flow in the inner, near-axis region, this is easily realizable without major efficiency or acoustic losses.
  • the embodiment according to FIG. 14 is made up of 12 identical segments, wherein the 12-fold rotational symmetry is locally interrupted by the only four attachment regions 18.
  • the number of different cells 6 is significantly reduced by segmentation with a high number of segments.
  • the inflow grating 1 has a total of 312 cells 6, but due to the segmentation, only 26 differently shaped cells 6 are present.
  • Embodiments of 8 segments are also particularly advantageous.
  • the number of segments is advantageously a multiple of 4.
  • a segmentation can also be used to produce a Einströmgitter 1 according to the invention, in particular for larger outer diameters, in several parts.
  • FIG. 15 shows the embodiment according to FIGS. 13 and 14 in a side view.
  • the connection regions 27 of the outer webs 35 to the outer connecting ring 25 are clearly visible.
  • the connection region 27, which is designed here as a rounding, can also be designed differently, for example as a chamfer.
  • FIGS. 13 to 15 the embodiment of FIGS. 13 to 15 is shown in a side view and in section on a plane through the axis.
  • the exemplified webs 5a and 5b do not overlap, as seen in the axial direction.
  • the connecting ring 25, seen in the axial direction does not cover the web 5a. All this is advantageous for a simple design of the injection molding tool, since undercuts between the webs 5a and 5b and the connecting ring 25 with respect to demolding parallel to the axial direction are avoided.
  • the webs 35b of the outer row which are located in the region of the attachment areas 18, are adapted for better accessibility to the screws, with which the inflow grille 1 is screwed to an inlet nozzle 2 or to a nozzle plate 32, and in its outer Reduced diameter.
  • These webs 35b are at least slightly offset in diameter also in diameter.
  • the central Anspritz Scheme 28 is clearly visible on average.
  • the liquid plastic injected centrally at this area can be distributed well over the webs 5 via the inner ends 31.
  • the inner ends 31 are advantageously rounded with the central Anspritz Scheme 28 or provided with a chamfer.
  • FIG. 17 shows by way of example a fan with an inlet grille 1, a nozzle 2 which is attached to a nozzle plate 32, and a fan impeller 3, which is driven by a schematically illustrated motor.
  • the air initially flows through the inflow grating 1 into the inlet nozzle 2, before it experiences a total pressure increase as it flows through the rotating impeller 3 of the fan. Turbulence in the inflow causes increased noise in the fan.
  • An inflow grating 1 according to the invention makes the inflow even and thus reduces the noise.
  • the inflow grille 1 also assumes the function of a suction-side contact protection. The pressure loss that occurs when flowing through the air through the grid 1 is minimized by the advantageous design according to the invention.
  • a diagonal fan 3 is shown.
  • the inflow grille 1 can be used equally well with a radial or axial fan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un ventilateur (ventilateur axial, centrifuge ou diagonal) comprenant une roue à aubes et un dispositif de pré-guidage dans le trajet d'écoulement devant la roue à aubes, de préférence devant la zone d'entrée d'une buse d'entrée. Le dispositif de pré-guidage est réalisé sous la forme d'une grille d'admission (1) pourvue d'éléments jointifs (5) plats, les éléments jointifs (5) formant une pluralité de canaux d'écoulement (6) du type cellule de grille. Les éléments jointifs (5) s'étendent principalement entre de préférence deux ramifications (15) ou entre respectivement une ramification (15) et une zone marginale (14, 31) et de préférence principalement trois éléments jointifs (5) par ramification (15) se rencontrent. En variante, les canaux d'écoulement (6) de la grille d'admission (1) présentent une section transversale alvéolaire et/ou la grille d'admission (1) forme un contour de type panier par rapport à la surface d'enveloppe extérieure et/ou intérieure. L'invention porte également sur une grille d'admission correspondante.
PCT/DE2019/200013 2018-04-09 2019-02-15 Ventilateur et grille d'admission pour ventilateur WO2019196992A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN201980038538.2A CN112262261B (zh) 2018-04-09 2019-02-15 风扇和用于风扇的进气栅格
BR112020020491-9A BR112020020491A2 (pt) 2018-04-09 2019-02-15 Ventilador e grade de entrada para um ventilador
KR1020207032305A KR20200141079A (ko) 2018-04-09 2019-02-15 팬 및 팬용 유입 그리드
US17/046,451 US11703065B2 (en) 2018-04-09 2019-02-15 Fan and intake grid for a fan
JP2020553571A JP2021519885A (ja) 2018-04-09 2019-02-15 ファンとファン用吸気格子
EP19715390.1A EP3775571A1 (fr) 2018-04-09 2019-02-15 Ventilateur et grille d'admission pour ventilateur
JP2023164145A JP2023169380A (ja) 2018-04-09 2023-09-27 ファンとファン用吸気格子

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018205300.6A DE102018205300A1 (de) 2018-04-09 2018-04-09 Ventilator und Einströmgitter für einen Ventilator
DE102018205300.6 2018-04-09

Publications (1)

Publication Number Publication Date
WO2019196992A1 true WO2019196992A1 (fr) 2019-10-17

Family

ID=66041085

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2019/200013 WO2019196992A1 (fr) 2018-04-09 2019-02-15 Ventilateur et grille d'admission pour ventilateur

Country Status (8)

Country Link
US (1) US11703065B2 (fr)
EP (1) EP3775571A1 (fr)
JP (2) JP2021519885A (fr)
KR (1) KR20200141079A (fr)
CN (1) CN112262261B (fr)
BR (1) BR112020020491A2 (fr)
DE (1) DE102018205300A1 (fr)
WO (1) WO2019196992A1 (fr)

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WO2021187927A1 (fr) * 2020-03-19 2021-09-23 케이비오토텍 주식회사 Soufflante pour siège de véhicule

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CN217421645U (zh) * 2022-03-03 2022-09-13 阳光电源股份有限公司 整流罩和风扇装置
EP4245999A1 (fr) * 2022-03-18 2023-09-20 Mann+Hummel Life Sciences & Environment Holding Singapore Pte. Ltd. Grille d'écoulement et dispositif de purification de l'air ambiant
WO2023234927A1 (fr) * 2022-05-31 2023-12-07 Itt Goulds Pumps, Inc. Carter de pompe
CN219101727U (zh) 2022-12-21 2023-05-30 台达电子工业股份有限公司 导流格栅

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BR112020020491A2 (pt) 2021-01-12
KR20200141079A (ko) 2020-12-17
US11703065B2 (en) 2023-07-18
CN112262261A (zh) 2021-01-22
DE102018205300A1 (de) 2019-10-10
US20210164495A1 (en) 2021-06-03
CN112262261B (zh) 2024-01-02
JP2023169380A (ja) 2023-11-29
EP3775571A1 (fr) 2021-02-17
JP2021519885A (ja) 2021-08-12

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